1 /*
   2  * Copyright 2017 JetBrains s.r.o.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 8174744
  27  * @summary Wrong rendering of string containing surrogate pairs on macOS
  28  */
  29 
  30 import java.awt.Color;
  31 import java.awt.Font;
  32 import java.awt.FontMetrics;
  33 import java.awt.Graphics;
  34 import java.awt.image.BufferedImage;
  35 
  36 public class SuppCharDrawTest {
  37     private static final Font FONT = new Font(Font.MONOSPACED, Font.PLAIN, 12);
  38     private static final int IMAGE_WIDTH = 20;
  39     private static final int IMAGE_HEIGHT = 20;
  40 
  41 
  42     public static void main(String[] args) {
  43         BufferedImage base = renderFirstChar("A");
  44         BufferedImage basePlusSurrogate = renderFirstChar("A \uD835\uDC00");
  45 
  46         if (!imagesAreEqual(base, basePlusSurrogate)) {
  47             throw new RuntimeException("Unexpected rendering change");
  48         }
  49     }
  50 
  51     private static BufferedImage renderFirstChar(String s) {
  52         BufferedImage image = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, BufferedImage.TYPE_INT_RGB);
  53         Graphics g = image.createGraphics();
  54         g.setColor(Color.white);
  55         g.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT);
  56         g.setColor(Color.black);
  57         g.setFont(FONT);
  58         FontMetrics metrics = g.getFontMetrics();
  59         g.clipRect(0, 0, metrics.charWidth(s.charAt(0)), IMAGE_HEIGHT);
  60         g.drawString(s, 0, metrics.getAscent());
  61         g.dispose();
  62         return image;
  63     }
  64 
  65     private static boolean imagesAreEqual(BufferedImage i1, BufferedImage i2) {
  66         if (i1.getWidth() != i2.getWidth() || i1.getHeight() != i2.getHeight()) return false;
  67         for (int i = 0; i < i1.getWidth(); i++) {
  68             for (int j = 0; j < i1.getHeight(); j++) {
  69                 if (i1.getRGB(i, j) != i2.getRGB(i, j)) {
  70                     return false;
  71                 }
  72             }
  73         }
  74         return true;
  75     }
  76 }